The AB system is the major blood group system in domestic cats. The common blood types are A and B. Cats with blood type A have naturally occurring anti-B antibodies at a low titer and cats with blood type B have naturally occurring anti-A antibodies at a high titer. A third rare type  AB  is also known.
An HVAC technician can install, repair, and provide maintenance on heating and air conditioning systems. Exterior wall vent leading to an HVAC system. HVAC technicians install, repair and maintain heating, cooling and venting systems.HVAC technicians are expected to be skilled in air conditioner repair.hen an HVAC technician is associated with the installation of a new system, he or she will be proficient in reading blueprints connected to the installation, and will participate in the preparation of the space for the installation of the required equipment.
In addition to the technical skills obtained through formal training, one also needs certain soft skills, or personal qualities, to succeed in this occupation. An HVAC technician needs good listening skills to receive information about the problem he or she is trying to solve. Good speaking skills will allow him or her to convey information to coworkers and customers. In order to meet the demands of a busy schedule, one also needs good time management skills.